Projector for page printers



Aug. 6, 1946. J. ZENNER ,4,W

APROJECTQR FOR PAGE PRINTERS Filed July 17. 1940 'rsheets-sheet 2 FIG. 4 66 w. L ZENNER PROJECTOR FORA PAGE PRINTERS Filed July lT, 1940 7 Sheets-'Sheet 3 l WALTER J. ZENNER Aug, w. J. ZENNER 4PROJEFJILOR FOR PAG-E PRINTERS 7 Sheets-snaai 4 Filed July 17', 1940 OWN INVENT OR.

WALTER .1. ZENNER.

w. J. ZENNER 7 Sheets-Sheet 5 INVENTOR, WALTER J.' ZENNER A ToRNEY.

PROJECTOR Fon PAGE PRINTERS Filed um 17, 1940 5 3N o W www I; l

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w. J. ZENNER 4659MB PROJECTOR FOR PAGE PRINTERS Filed Jul;r 17. 1340 7 vsneets--sheei 'r 1N VENT OR,

,- WALTER .1. zENNx-:R BY

Patented Aug. 6, i946 Waiter J. zeur-ier, Des Plaines, nl.,

'leletylly Corporation, Chicago,

tion of Delaware assiinio'r to Ill., a corpora- Application July 1'7, 1940, seria-IN1). 346,004 s claims. (c1. zie-24) The present invention pertains to printing telegraph projection systems and apparatus and more particularly to combination page printers and projectors for displaying on a screen or inspection area information in enlarged characters.

The primary object oi the invention is to provide an efficient and reliable projection system for displaying on a screen telegraphically received message matter.

Another object of the invention is to provide a printer-projector in which the parts of theV receiving printer are arranged and constructed to facilitate the projection and display of printed matter resulting from operation of a printing telegraph receiver.

According to the present invention a projection system has been provided which embodies a page printer, of the type shown in U. S. Patent No. 1,904,164, designed to give upon a screen a running account of received message matter, through the instrumentality of an optical system comprising an arrangement of inclined mirrors so that the printer and lamp housing may be 1ocated at the lower part of a suitable cabinet, and the screen formed as a part of theA upper forward wall of the cabinet and positioned above the printer compartment.

Specically, the page printer is mounted on rails supported in a structural frame to which is pivotally mounted the lamp housing, in such manner that the lamp housing with its condensing lenses is positionable so as to embrace within the field of projection the last line of printing, and also to include eight or ten printed lines. Printing is effected on a cellophane strip and the image of the record produced thereon is projected through the optical system onto the screen. The cellophane web or strip is drawn upwardly through the projection eld. rIfhe characters on the section of the web in the projection eld are so arranged as to form horizontal lines one above the other, and the images of said horizontal lines of characters are projected on the screen. The horizontal lines of images on the screen moveupwardly across the screen similar to the movement of the web through the projection field.

The lamp housing together with the condensing lenses is swingable upwardly about its pivotal articulation with the structural frame to permit ready access to the page printer. The frame is movable on rails so that the entire structure including the printer and lamp vhousing may be rolled outwardly to permit withdrawal and thusy render the apparatus carried by said frame accessible for servicing.

A featurev of the arrangement according to the present invention resides in the means for case shifting the cellophane web in the projection field to control accurately the shifting movement of the printed record. Although the cello- 2 phane web is permitted te escape from the supply roll in a stp-by-step manner, nevertheless said web is maintained taut between the,web withdrawing or supply roller and the web take-up mechanism. Y The latter mechanism comprises a paper or web pulling device whereby the web'is pulled past the printing point and through the projection field after the printing of a line.

urther features of the invention reside in providing a lamp housing having a baille plate cooling means utilizing convection currents of air between the outer casingand the bane plate; a disc platen movable with the type carriage wherein printing isl effected on the peripheryy of the disc and the number vof hidden printed characters is reduced to a minimum; and three-point mounting of the large or upper reflecting mirror to eliminate the possibility of injury to the mirror due to twisting action.

The foregoing and other objects and features of the invention will appear from the following detailed description taken in conjunction with the accompanying drawings, in which,

Fig. l is 'a perspective view of the projection cabinet with a part of the Wall broken away to show schematically the optical and projection system 1 Fig. 2- is a cross-sectional view of therprinterprojector according to the present invention; j y Fig. 3 is a 'fragmentary' perspective view showing the manner of attaching the'screen to the cabinetj y l Fig- 4 is a detail cross-sectional lview of the large ree'cting mirror;

Fig. 5 isan enlarged sectional view taken on line 5--5 ofF'S. 2;

Fig.. 6 is an enlarged side view and partial `section of the printer mechanism and associated lamp housing and part of the optical arrangement; j

Fig. 7 is a plan view of the lamp housing and lens` support taken on line 1;'1 of Fig. 2;

Fig. 8 is a plan View of the printer-projector apparatus; .I i'

Fig. 9k is' an eievauonn projectorv apparatsi Fig. v10 is an enlarged cross-sectional view' of thev printer platen and platen frame;

Fig.A 11 is a View taken substantially on line H il ofi-iig. 10; v

Fig. 12 iSn a" top' 'View of the part f the printer mechanism s'hoilv'nn in Figs. 10`and 11;

Fig. 13 is a perspective view of the shift control mechanism for the projection eld; Y

Fig. 14 is an enlargedV cross-sectional view of the connection between the platen frame andthe shift control mechanism for the projection field; Fig.y 15 is an elevational view of the stereopticon slldecarrier of the present invention;

view of the printering I1 and condenser 'upon the bottom of Vthe upwardlyto `a point close ltween the outer casing 21 essere type; par' taken on line I8-I8- Having reference to the drawings in which like reference characters indicate similar parts throughout the several viewsjthe combination,v

page printing and projecting'apparatus according .to the present invention is housed in a cabinet, indicated generally by theV numeral: vI I,

which is provided in the lower portion .thereof j with a door I2, and in the upper portion with 'a translucent projector screen I3. Secured to the floor of cabinet II are'twofangle iron rails I4 (onlycne of which is shown in Fig. l) which provide a track for the frame I (Fig. 2)V which supports the page printing apparatus, indicated generally by the numeral I6, the lamp housing I1, andthe voptical arrangement represented generally by condensing lenses I8, small mirror I9 and objective lens V2I. tWheels 22 are journaled to .thebottom side members of the vframe I5 and co-operate in rolling relation with rails I4which are provided with indentations 23 into Vwhich the wheels 22 are admitted when the frame I5, in 'assuming its fully inserted position in the cabinet I I, rests upon spacing bosses 25.` In the fully inserted position, the framel` is anchored by means of ,bolts to the base vof the cabinet I l. With this arrangement, the frame is easily insertable in the cabinetifII by'means of rollers 22, and moreover isadapt'edvwhen the proper position has beenassumedgfto rest upon bosses 25,'and then toV be anchored t'the cabinet II by the bolts 36 (Figs;2 and 5)."

At each side of frame I5 and disposed at the 'rear thereofv are pivot supports'24 for a U-shaped frame' 26 (Fig.7) which carries the'lamphous'- lenses I8. "A bar 20 (Fig.

6) is pivoted to frame 26 and the lowerjend of K said b ar is provided with a hook portion '(not shown) wby which, when Vtheframe 26 is swung Y upwardly about pivots 24 `to facilitate removal o f the printer for servicing, the bar is held ins-its upward position by the engagement ofsaid hooked portion with a spacer stud (Fig. 8),

in a well-known manner, the bar 26 thus serving as a brace or support. The lamp housing vI1 comprises an outer casing 21 (Figs. 2 and '7) which is secured to a plate 28 fastened to a crossbar 23 of the frame 26. vContained within the lamp housing l1 and suitably spaced from the outer casing 21 thereof is a baille plate 3l which rests housing I1 andextends tothe top, as illustrated in Fig. 2, The bottomlof the housing I1 is provided, between the outer casing 21. and the baffle plate V3|, with apertures 32. This construction permits the ilow of convection currents beand the, baille plate 3I I1 is provided for cooling purposes. Housing with a cover 33 having a grilled section 34 covered by a meshing if desired. Depending vfrom the cover 33 and spaced therefrom is a baille plate- 36 (Fig. 2) of substantially the same area as the opening 34'. To protect the condensing lenses IB from the heat of lamp 31, the bottom of the housing I1 maybe cut away as at `38; Lamp 31 is adjustably clamped to a bracket 39,'which in turn is'adjustably supported by the 'floor of the housing I1. A reflector 4I is spring clamped by a carrier 42 which is adjustably supported, through the 'instrumentality of a rodl 43 and the enlarged mounting holes for plates 45, by the outer casing 21 of the lamp housing I1.

@In the embodiment of the invention shown in the drawings, a condensing lens system I8, comprising two plano-convex lenses and one conveXo-convex lens, is provided, these lenses being suitably clamped by clamps 44 (Fig. 7) to plates 28, 46 and 41 which are appropriately separated by spacing posts 50 and 5I. Plate 41 is secured alongpits top edge to a crossbar 48 (Fig. 2) of frame 26. Plates 28, 46 and 41 are suitably apertured `to provide a held of projection of such area as to present upon the screen i3 (Fig.v l) a predetermined number of lines of printing produced on the record strip or web 49 of transparent material.

As previously mentioned, the optical system of the present invention includes a mirror I9 and an objective lens 2I. The optical system also includes a mirror 5I (Fig. l) supported in the upper part of the cabinet II, and through this system the image is projected upon the screen I 3. The mirror I9 is adjustably pivoted on a pair of standards 52 by means of which its angular position may be determined. Moreover, standards 52 are adjustably mounted on brackets 53 secured to frame I5. The objective lens 2 I is adapted to be -adjustably clamped by a clamping band 54 which is supported on a U-shaped bracket 56, which in turn is secured to a crossbar 51 on frame l5. Thus, the adjustable mountings provided for the mirror I9 and the objective lens 2I facilitate the proper positionment of the image on the screen.

Mirror 5I is supported at three points to minimize, or even eliminate the possibility of injury to the mirror due to a twisting action. Mirror 5I is secured to the cabinet I I through the instrumentality of a bracket 58 located centrally of the bottom edge of the mirror- At each of the upper corners offmirror 5I is provided a bracket 59 by means of which the mirror is secured to the roof of cabinet I I. Mirror 5I is in the form of a regulartrapezoid, with the shorter of the parallel sides positioned' contiguous to bracket 58. The trapezoidal shape of the mirror 5I conforms to the effective shape of the eld of projection at the angleat which Vmirror 5i is placed in cabinet Il. Mirror 5I, so shaped, produces a rectangular visual field or ield of projection on screen I3, which accordingly is of rectangular conformation.

Mirror 5I is mounted in -a shock-proof frame substantially as shown in Fig. 4. In the present between the two layers of glass. The metal Aprojected on to embodiment, the mirror frame comprises angle i -uponfeltstrips 62 interposed between the mirror and the angle iron. A layer of mastic (or other nonhardening) cement 63, which has the properties of adhesiveness, is spread evenly over the mirror 5I upon which is laid a metal backing plate 64, The felt strip 62, mirror 5I, mastic cement 63, and metal plate 64 are appropriately clamped together by means of strips of angularly shaped clamps 66 secured by screws 61 to frame 6I. Mirror 5I is a built-up assembly of shatterproof glass, the mirrored surface being located backing plate 64 may be further reinforced by reinforcing strips 68. y

The' projection screen I3 is composed of translucent material so as to permit an image to be it from the rear and be visible from the front of the screen. In the present form of the invention the screen I3 is provided with a 4similar to function lever |01 stout binding 69 having eyelets 'H therein. The cabinet I I is provided with a series of studs or buttons 12 properly spaced around the edge of the'opening to be covered by screen I3. The screen I3 is then fastened to the cabinet II by means of a lacing 13 which passes alternately through eyelets 1| and studs 12, and in this manner the screen is drawn tightly and evenly acrossthe opening provided therefor. A corner strip 15 is provided around the edge of the screen |3 to protect the lacing connection between the screen and the cabinet.

A blower or exhaust fan 14 (Fig l) is located at the upper part of the cabinet and is positioned behind the mirror 5|. Blower 14 is so mounted that its exhaust port projects through an aperture 16 in cabinet II, and is suitably supported in said cabinet.

Having reference to Fig. 2, a page printer of the type shown in U. S. Patent 1,904,164 is mounted in the frame I5. The printer, indicated gen erally as I 6, has been modied in certain respects to adapt it for use with the projector of the present invention` The page printer comprises the side frames 18 and 19 (Fig. 6) to which is pivoted at 8| a platen frame, indicated generally as 82. The usual cylindrical form of platen has been dispensed with in the present embodiment of the invention and has been substituted by the disc form of platen |13 shown in Figs. l0, 11 and 12, and which will be hereinafter described.

To provide a running account of the message printed on the page material, a delivery mechanism is provided which comprises a means for permitting the record material to escape from the supply roll, suitable guides, and a web pulling means whereby the page material is advanced through the printing zone. T he page material 49 in being delivered from the roll 83 is directed over a slack bar 84 which is pivoted at 85 and is normally biased clockwise by a spring 86 to maintain the page material or Cellophane web taut between the roll 83 and a flanged cylindrical guide 81 carried on a shaft 88 journaled in plates 89 depending from side frames 18 and 19. The web 49 is then directed over a roller 9| to which is fixed a ratchet wheel 92, the ratchet wheel and roller being carried on a shaft 93 journaled in the plates 89 secured to side frames 18 and 19. Cooperating with the roller 9| is a pressure roller 94 which is carried on a standard 96 secured to a rock shaft 91. Pressure roller 94 is drawn into pressing relation with roller 9| Iby means of a spring 98. Secured to rock shaft 91 and located injuxtaposition to release lever 99. Co-operating with lever 99 is a shoulder on plate 89 arranged so that when lever 99 is actuated counterclockwise (as viewed in Fig, 6) against the action of spring 98 it will latch-up behind or on the left-hand side of the shoulder IGI, thereby releasing the pressure roller 94 from engagement with pressure roller 9| and maintaining this condition until lever 99 is again released from the shoulder IUI to permit spring 98 to bring roller 94 again into pressing relation with roller 9 I. Associated with the ratchet wheel 92 is a pawl member |92 (Fig. 2) which is loi-voted to a bell crank lever |03 carried on a pivot shaft |04. The depending arm of bell crank |03 is pivoted to one end of a push rod |06, the other end of which is shouldered to co-operate with a function bail |08 in the manner shown in the aforementioned Patent 1,904,164. Thus, in response to a' predetermined selection a function lever,

shown in Fig. 6, is

plate 89 is a pressure roller selected to raise the free end of push bar |16 up' wardly into the path of the function bail blade |08. Then, when the push rod |96 is actuated leftwardly by the function bail |08, clockwise rotation is imparted to bell crank lever |03 to impart in turn, downward movement to pawl |02. In this manner, the ratchet wheel 92 is rotated clockwise Vone step, which, through the co-operaa tion of pressure rollers 9| and 94, acts in co-operation with a web pulling device to deliver a predetermined amount of record material 49 from the supply roll 83 to the printing zone and the projection area.

The record material 49 is brought to the printing position by means of a pulling or drawing mechanism now to be described. The record material 49 as it leaves roller 9| is directed around guide rods |89, III and ||2. These guide rods may take the form of fixed rods, carrying guide rollers thereon to eliminate friction. From the guide rod ||2 the record material 49 is directed vertically through the printing zone and projection field to a guiderod I I3 carried by a U-shaped shifting frame member |14 (Figs. 2, 6, 8 and 13) pivotally carried on pivots |I5 and IIB (Fig. 8) suitably journaled in the frame I5. The page material 49 is then directed around a guide rod ||1 carried in supports 8 (Fig. 6) depending from bars ||9 secured to angle iron crossbars I2| and |22 of frame I5. From thence, the page material 49 is directed around a spindle |23 xedto a shaft |24 journaled in standards |26 sup ported on said bars ||9.

Shaft |24 is interconnected through a friction clutch |21 (Fig. 8) to a pulley |28. Continuous counterclockwise rotation (as viewed in Fig. 6) is imparted to pulley |28 through the instrumentality of a belt |29 connected to a pulley I3| fixed to the main operating shaft |32 carries a gear |33 which meshes with a pin-Y ion gear |34 fixed to shaft|35 of a motor |36 (Fig. 2). Motor |36, therefore, through gears |34 and |33, shaft |32, pulley |3|, and belt |29 imparts continuous rotation to pulley |28 which through the friction clutch |21`i'mparts a con* stant torque through shaft |24 to the spindle |23. With this arrangement the page material 49 is maintained in a taut condition between the spindle I 23 and the roller 9|. Thus, when the ratchet 92 is rotated one step a predetermined amount of the page material 49 is delivered from the supply roller 83, which material is immediately taken up by the spindle |23 to preserve the taut condi'- tion of the page material.

As disclosed in the aforementioned Patent 1,904,164, the page printer I6 is controlled telegraphically by a selector magnet |31. 'Ihis is connected in a signal line (not shown) on which are impressed code combinations of signaling iinpulses. The code signals control, through the selector magnet I 31 of a sword and T=type selector (not here shown, but illustrated and described in said patent) a series of selector vanes |38, which in turn controls through bell cranks |39 (Fig. 9) a set of curved code bars 4| (Figs. 6 and 9). Code bars |4| and bell cranks |39 are supported on a movable type carriage, indie cated generally by the numeral I 42, which is prok vided with rollers |43 and |44 whereby it is adapted to travel on tracks |45 and |46, respectively, positioned between side frames 18 and 19. Cooperating with code bars I 4| are a plurality of pull bars |41 having individual springs |48. Pull bars |41 are operatively connected by rack 32 of the page print. ing apparatus shown in Patent 1,904,164. Shaft end of its upper |6| is a function bail comprising arms |65 ywhich-tend to rotatek and pinion connections to a corresponding plurality of type bars |49 pivoted on a shaft |5|.

'Type carriage |42 is also provided with a spacing rack |52 which mechanism .(not shown) similar to that illustrated in Patent 1,904,164, to control the movement of type carriage |42 to form character spaces, tending in this movement to wind up a carriage return spring mechanism, indicated generally in Fig.,8 as |50, the strap |60 of which is secured tov studV Yfastened to type carriage |42. Upon receipt of the carriage return signal, a function lever (similar to lever |01) is selected and the carriage return mechanism actuated in themanner described in the aforementioned Patent 1,904,164. Carriage return mechanism |50 is thereupon permitted, due to the energy stored therein, to return the type carriage |42 to its normal or beginning-of-line position.

.A pull bar bail |53 is mounted in the type carriage |42 and is provided with a roller |54 carried on the bottom side thereof on a stud |55. Roller |54 operates between a pair of blades |56 and |-51 of a main printing bail |58 so that bail |53 can be reciprocated by bail |58 in any character spacing position of the type carriage |42. Fastened to the printing bail |58 is one end of a printing spring |59, the other end of which is connected to a printing blow adjustment means as shown in Patent 1,904,164. Bail |58 is mounted on a shaft [6| on which is also carried a printing bail actuator |62` which co-operates with a printing cam |63. Actuator |62 carries at the arm a stud |64 which has abutting relation only with printing bail |58 and is not permanently connected thereto, which is to permit spring printing. Printing -bail |58 is also provided with a pair of arms |66 which carry a function lever bail |69. Also carried on shaft and |61. Arm |65 is provided with a follower roller which co-operates with a function bail cam |68, and armV |61 supports on its end the function bail blade |08.

Associated with the selector varies |38 are a plurality of function levers |01 mounted on pivot rod |1| Yand provided with indi dual springs |12 the function levers clockwise into registry with the selector vanes |38. The function levers |81 are normally held out of engagement with the selector vanes |38 by means of the rod |69 of the function lever bail.

'A s previously mentioned, the platen frame 82 .is pivotally supported on pivots 8| in side frames 18 and 19. The platen comprises a circular disc |13 (Figs. 6, 9, 10, 11 and 12) rotatably mounted on a carriage |14 which is slidable on rods |15 and |16 carried by platen frame 82. Platen carriage |14 is connected to the type carriage, as will be presently described, so as to be movable therewith, the effective printing edge of the platen |13 being located coincident with the printing point or Zone determined by the path of operation of the type .bar |49. Y

The platen frame 82 is adapted to be rocked from ,the letters or unshift `position to the figures or shift position vin the manner fully set forth in the aforementioned Patent 1,904,164. Briefly, the side frame of the platen frame 82 (as shown in Fig. 6) is provided with a lug |11 which operates between two adjustable stops |18 and |19. -Adjacent to lug |11 to the side frame ofthe platen |8|, the upper end of a link there is pivoted frame 82 on pivot |82, the lower end of which is pivoted to the horizontal arm of a bell A* co-operates with a spacingr crank lever |83 pivotally mounted at |84. To the lower end of the depending arm of bell crank |83 is pivoted push bar |85, the free end of which cverlies a leftwardly directed arm of the function lever |01. Push bar |85 is also provided with a shoulder |86 which co-operates with the function -bail blade |08. The platen frame 82 and platen |13 are shown in Figs. 6 and 10 in the letters or unshift position, with the stop lug |11 against the upper stop screw |18. Thiscondition is achieved when the function bail blade |08 has operated upon the shoulder |86 to move the push bar |85 leftwardly to rotate the bell crank |83 clockwise, thus raising the link |82 to cause the platen frame 82 to rock clockwise.

A correspondingly similar construction is provided for the gures or shift mechanism. That is, a shift function lever similar to lever |01 is provided which when selected is caused to rotate clockwise to bring its rearwardly extending arm into operation to raise al push bar, similar to bar |85, into the path of the function bail blade |88 which, when it is permitted to operate leftwardly (as viewed in Fig. 6) will cause a bell crank, sim.- ilar to bell crank |88, to pull down a link similar to |82 to rock the platen frame 82 counterclockwise to bring its stop |11 against the lower stop screw |19. The platen frame 82 is maintained in its shift or unshift position by a spring actu-A ated detent member |81 acting on a detent roller |88.

An arrangement is provided, according to the present invention, for accurately controlling and accelerating the shifting movement of the portion of the record material which is in the field of projection, in response to corresponding movement of the platen between the upper and lower case shift positions. Accelerating the web shift minimizes the optical effect upon the image. As previously alluded to, the U-shaped shifting frame member H4, which is pivotally supported at ||5 and ||6 in the frame l5, carries a guide rod |3V for the record strip 49 which co-operates with guide rod ||2 to guide the record material through the field of projection. Frame member H4 is operable between adjustable stops 244 and y 245 mounted on arms `246 and 241, respectively,

of bracket 248 fixed to the cross bar |2| (Figs. 6 and 13).

Mounted on bracket 248 are elements comprising an overcentering device which co-operate with the shift frame 82 to effectuate the control of the record strip in the projection field. The overcentering device comprises a lever arm 249 pivoted at 25| to bracket 248, and is articulated to the member |||4 at 252. Lever 249 terminates in a forked end 253 in which a stud 254 is slidably operable. Stud 254 is mounted on the end of a. lever arm 255 pivoted at 256 to bracket 248. A spring 251 is extended between stud 1254 and a springpost 258 carried on bracket 248. Spring post 258 and pivots 25| and 256 are arranged on a common center line substantially intermediate the stops 244 and 245 sok that bar I I4, after passing over center above or below said line, will be urged` by spring 251 against stops 244 or 245, respectively,

Member I4 is connected to the platen frame 82 by means of a pair of lever members 259 and 26| which are pivoted to frame 82 at 262and 263, respectively (Figs. 6 and 13). Members 259 and 26| are each provided at the upper end thereof with an open-ended slot 260 which fits over the shank of a headed ,stud 281 and 266, respectively. With this arrangement, the members 259 and 26|,

the light cone.

ltions of the platen may be easily disconnected from studs 265` and 266 so as to render the printer readily detachable from the frame l5. Supported by the depending arms of the levers 259 and 216| is the previously mentioned guide rod ||2. Levers 259 and 26| are normally urged in a counterclockwise direction (as viewed pivots 262 and 263 by individual springs 264 anchored to spring posts 205 xed to rail .206 of the platen frame `82 (Fig. 14).

Having reference to Figs. 6 and 13, the frame ||4 is illustrated as movable with platen frame 82. To assure a definite extent of movement of frame H4, the stops 244 and 245 are provided. The platen frame 82 is shiftab-le between stops |18 and |19 by the spring action of detent |81 which is in the nature of an overcentering means because, as link |82 acts to rock the platen frame 82 between the two shift positions, the camming action of detent |81 operates to assist and hasten the shifting movement. The action of the overcentering device mounted on bracket 248 is comparable, and to permit this assisting action, the hole 266 (Fig. 14) in each of the levers 259 and 26| is elongated so that the overcentering action takes eiect immediately upon passing over center independently of the entire movement of platen frame 82, and urges frame I4 into proper position against one or the other of the adjustable stops 244 or 245. In other words, the platen fra-me 82 begins the movement of the frame I4, and the overcentering device completes this movement suddenly upon passing over center, the elongated holes 266 permitting the overcentering device to take the control of the frame ||4 from the platen frame 82.

In Figs. 10, 11 and 12 is illustrated the Inanner in which the platen carriage 14 is connected to the type carriage |42 so as to be movable therewith. As previously mentioned, the platen carriage |14 is slidably supported on rods |15 and to a member |9| which is secured by screws |92 .to the type carriage |42. As viewed in Fig. 12, the circular platen |13 is rotatably mounted on the platen carriage |14 by means of an eccentric screw means |93. By means of the adjustment |93 the platen |13 is adjustable toward and away material to vary the clearance in Figs. l1 and 12, is also provided for the platen |13, through the instrumentality of the eccentric adjusting means-|90.

An important feature of the is the provision of' a, platen so positioned as to reduce to a minimum the obstruction of the projected image by the platen. To achieve this result the platen 13 is tilted, with respect to the record material printed upon, suiiiciently to clear The peripheral surface of the which printing is eil'ected, is that in one of the shift posithe peripheral surface of the platen will be parallel to the record material. In the present embodiment the peripheral surface of the platen |13 is parallel to the record strip when the platen frame 82 has been shifted to the upper case position as indicated in Fig. by the dotted line |94 of the platen |13.

To compensate for this arrangement of the platen |13', the type faces on the type bar |49 are arranged as shown in Fig. 17. Moreover, this platen |13, upon slightly beveled so 'arrangement of type faces in co-operation with in Fig. 13) about their respective' present invention Voo sponse to each carriage return operation.

la shield (Fig. 10) serves (as will presently appear) to prevent smudging during the printing operation. As is well known, the type bar |49 is provided with an upper case type face |96 and a lower case type face |91 (Fig. 17). However, according to the present invention the lower case ytype face |91 is provided with a slope corresponding tothe slope of the periphery of the platen |13 when in the lower case position. The dimension 201 of the upper case type |96 is arranged to be slightly less than the minimum height 2|0 of the lowercase type 91. When printing is eiected in the lower ease position, the type face |96, being lower than the type face 91, will not touch the record material and hence no smudging of the printed record will occur` When printing is eiected in the upper case position, means isprovided for preventing the lower case type face |91 from coming into direct contact with the surface of the record material. To achieve this result a shield |95 is provided which is adapted to be interposed vbetween the type face |91 and the platen |13 when printing is being effected in the upper case position. Shield |95 is secured to the ribbon oscillating member |99, which, as described in the aforementioned Patent 1,904,164, oscillates the inking ribbon into and out of the path of the type faces during the printing operation. The ribbon oscillator |99 is pivotally articulated toarm 20| of a lever 202 which in turn is pivoted at 203 to a lever 204 pivoted at 220 to the type carriage 42. Lever 204 is arranged to carry a roller 205 which rides on the bottomI side of a rail 206 mounted on the platen frame 82, as disclosed inthe aforementioned Patent 1,904,164. Roller 205 is pressed against the rail 206 by a spring (not shown), so that when the platen frame 82 is rocked between the shift and unshift positions, roller 205 will constantly contact with said rail 205, and lever 202 will be reciprocated therewith.

The depending arm 208 of the lever 202 is operably associated with the pull bar bail |53 (Fig. 6) so that the reciprocative motion of bail |53 will cause the oscillation of the lever 202 about pivot 203, whether the platen frame 82 is in the shift or the unshift position. Thus, when the bail |53 is in its normal position (the leftward position as shown in Fig. 6), the lever 202 will hold the inking ribbon, through the instrumentality of the ribbon guide (not shown) located at the upper extremity of member |99 (Fig. 10) in its downward position to effect visibility of the printed character. When the bail |53 moves rightwardly for a printing operation, the ribbon vwill be raised to printing position due to the counterclockwise movement imparted to the lever 202 by the bail |53. When the platen frame 82 is in the position shown in Fig. 10, which is the lower case printing position, the shield |95, upon oscillation of lever .202, will not be raised sufiiciently to b e interposed between the type face 91 and the platen |13. Howeven when the platen frame 82 is in the upper case printing position with the platen |13 in printing relation with the upper case type face |96, the shield |95 will, upon reciprocation, be raised so as to become interposed between the lower case type face |91 and the record material, thus preventing any ink which has accumulated on the type face |91 from smudging the record material.

As illustrated in Figs. 10, 11 and 12, there is provided a platen rotator for automatically changing the printing point of the platen |13 in repreviously described, the platen |13 spaces with the type carriage |42, and accordingly is spaced step by step for character spacing and, upon reaching the end of'the line, the platen |13 is returned rapidly with the carriage |42 to the beginning-of-line position.V In contact with the platen |13 at a point opposite to the printing point is a closely wound coiled spring 200 which isconnected at its ends to the side frame members of the platen supporting frame 82, in such a manner that the platen |13 is caused to rotate as it advances duringcharacter spacing. Moreover, upon the rapid return movement of the platen |13 (under the influence of the carriage return spring |50) during the performance of the carriage return function, the platen |13 will, owing to the combined `sliding and rolling relation with the yieldable spring member 200, rotate incommensurately, thus causing the same printing point of the platen to be presented to the type bars a minimum number of times. In other Words, through the instrumentality of the platen rotator 200, the platenY |13 is controlled in such manner as to reduce to a minimum .the number of times anyparticular printing point on the platen is impinged upon, thereby reducing to -a minimum the wear at any given point and hence prolonging the life of the platen. In lieu of the coiled spring 200, a taut wire or cord can, of course, be used.

In accordance with the present invention, the printing apparatus used in combination with the projection system is of such structure and arrangement that it is not affected by change in physical position of the assembly as a whole with respect to gravity. Specifically, a counterweight is provided which is associated with the movable type carriage |42 so 4as to render the movement of the type carriage |42 independent of the force of gravity, and to assist the carriage return spring in uniformly moving the type carriage in any physical position of the printer.

As previously described, the type carriage |42 is movably supported on tracks |45 and |46, and after being operated upon by the spacing mechanism, the carriage |42 is returnable to the beginning-of-line position by the carriage return spring mechanism |50. Having reference to Fig. 8, the type carriage |42 has secured thereto a bar 209 to the center of which is secured a stud 2|| on which is pivoted a har 2|2. A strap 2|3 is secured to end 2|4 of bar 2|2, and extends around an idler roller 2|5 and is secured at 2|6 to a counterweight 2|1. Roller 2151s rotatably supported on a bar 2|8 suitably positioned in the frame I5. Secured to end 2I9 of bar 2I2 is a strap 22| which extends around an idler roller 222 and is fastened at 223 to the counterweight 2|1. Idler roller 222 is rotatably mounted on the bar 2 8. Counterweight 2 1 is provided with rollers 224 and 225 (Fig. 9) which roll on upper rail 226, and rollers 221 and 228 which roll on lower rail 229. Rails 226 and 229 are appropriately supported in theframe. I5. Secured at 23| to the counterweight 2 I 1 is astrap 232 of a spring return mechanism 233 comparable to the carriage return spring mechanism |50. The spring return mechanism 233 is mounted on a bracket 234 secured to the frame I5.

As the carriage |42 advances step by step in response to the spacing mechanism, the carriage return spring mechanism |50 is wound up and energy is stored therein in readiness to return the carriage. At the same time, the carriage return s mechanism 233 is also wound up to store energy slide is mounted on the flanges therein, so that when the carriage return signal is received by the printer the carriage is freed in the manner described in the aforementioned Patent 1,904,164, and the carriage return operation is eiected through the release of the energy stored up in the return mechanisms |50 and 233. In the embodiment shown in Figs. 8 and 9, the return of the carriage |42 and the counterweight 2 I1 is illustrated as effected by two return mechanisms, the return mechanism |50 acting directly upon the type carriage |42 and the return mechanism 233 acting directly upon the counterweight 2I1. The two return mechanisms co-operat'e to facilitate the return of both devices. 1f desired, a single return mechanism may be employed by providing a return spring mechanism of suicient strength to return both devices. In this event, the spring return Vmechanism may be located either at the position shown by the return mechanism |50 or by the return mechanism 233. The carriage return mechanism |50 is provided with a dashpot buffer mechanism as is shown and described in the aforementioned Patent 1,904,164.

The counterweight return mechanism is similarly provided with a buffer mechanism. This buier mechanism comprises a dashpot 235 suitably mounted in the plate 236 secured to frame I5. Pivotally supported at 231 on bracket 240 and properly positioned with respect to buffer 235 is a buffer lever 236. The rounded end of lever 238 nts into a notched portion of the plunger 239 of the buffer 235 (Fig. 18). End 24| of the plunger 239 is adapted to receive the blow from the counterweight 2|1, said end 24| being receivable in the'counterbore 242 in the counterweight 231. The counterbore 242 is indicated in the present embodiment for structural purposes only and is not an essential element of the structure. The resistance of pneumatic buffer 235 is varied by means of adjustable ports, inV a well-known manner. A spring 243 tends to rotate lever 238 in a counterclockwise direction (Figs. 8 and 9) about pivot 231 to restore the buier mechanism to its operative position.`

The present invention also contemplates the projection of predetermined message matter or other information of a iixed nature by providing a stereopticon slide, as illustrated in Figs. 15 and 16, which is readily insertable into the eld of projection. The stereopticon frame 21| comprises a plate having integral flanges 212 and 213, which are conformed at their upper ends with hook portions 214 and 215, respectively, which embrace guide rodk |I3. Flange 213 is provided at its lower end with an extension 216 which bears against guide rod I I2 (Fig. 16) thereby serving to steady the frame 21| against oscillation and simultaneously to hold the frame 21| in the proper vertical plane coincident with the eld of projection. Frame 21| is readily insertable in the projector by means of the handle portion 211 (as shown in Figs, 15 and 16, for example). Frame 21| is also provided with an aperture 210 of a size determined by the area of the projection field, so that a stereopticon slide of. suitable dimensions may be placed thereover. The means for supporting and holding the stereopticon slide comprises a pair of flanges 218 and 219 integra-l with the frame 21| at the bottom edge thereof, and a retainer comprising aspring clip 28| pivotally secured to the frame 21| and properly spaced therefrom by a spacer 282. Thus, to insert a stereopticon slide, the spring clip 28| is swung aroundits pivot to its horizontal position, and the 218 and 219; and

after pressing the slide lightly against the frame 21|, the spring clip 28| is again swung back to the position shown in Figs. 15 and 16, thereby serving to retain the slide in place.

It is understood that the features of the present invention are not to be limited to the specic forms described herein, but embrace all forms which come within the scope of equivalency of the appended claims.

What is claimed is:

1. In combination, a printing device having a carriage movable to form character spaces, means for directing record material through said device comprising means for guiding said material in a vertical plane above and adjacent to said carriage, means comprising a projection system for projecting onto a screen images of the characters produced on said record material, means for case shifting said guiding means, and means comprising positive stop elements and overcentering means operable therebetween to accelerate shifting movement of said guiding means independently of said case shifting means to minimize the optical eiect of said shifting movement upon the image.

2. In combination, a printing device having a carriage movable to form character spaces, means for drawing record material through said device comprising a pulling device disposed beyond the exit end of a vertical projection eld located immediately above the printing point and an intermittently operable delivery means positioned in advance of said projection eld, means comprising a projection system for projecting onto a screen images of the characters produced on said record material in said projection eld, means positioned between said pulling device and said delivery means for sluiting said record material for recording upper and lower case characters thereon, and overcentering means to accelerate shifting movement of said shifting means to minimize the optical effect of said shifting movement upon the image.

3. In combination, a printing device having a type carriage movable to form character spaces and a platen movable with said carriage, means for drawing a web through said device comprising a pulling device disposed beyond the exit end of a vertical projection eld located `immediately above and including said platen and delivery means positioned in advance of said platen, means comprising a projection system for projecting onto a screen images of the characters produced on said web, means for case shifting the web in said projection eld, and overcentering means effective to accelerate shifting movement of said web to minimize the optical effect of said shifting means upon the image.

4. In combination, a printing device, means for drawing a web through said device comprising a pulling device disposed beyond the exit end of a vertical projection eld located immediately above and including the printing point and delivery means positioned in advance of said projection field, means comprising a projection system for projecting onto a screen images of the characters produced on said web in said projection eld, means positioned between said pulling device and said delivery means for shifting said web for recording upper and lower case characters thereon, and overcentering means to accelerate shifting movement of said shifting means to minimize the optical effect of said shifting movement upon the image.

5. In a projection system, a framework, a lamp 4 said framework, a.telegraph receiver mounted in said framework in co-operative relationship with said lamp housing and lens system, a web directing means so arranged with respect to said receiver and lens system as to provide a vertical lprojection eld, recording means in said receiver for producing lines of printing on said web in said projection eld, means for case shifting said web in said projection eld to facilitate recordation of upper and lower case characters thereon, means for moving said web so as to direct said lines of printing upwardly across said projection field, mirrors and an objective lens co-operating with each other so as to produce upon a screen an image moving thereacross in correspondence with the movement of the web through said projection eld, and overcentering means effective independently after a predetermined initial operation of said case shifting means to accelerate shifting movement of said web in said projection eld to minimize the optical eiTect of said shifting movement upon the image.

6. In a projection system, a framework, a lamp housing and condensing lens system supported on said framework, a telegraph receiver mounted in said framework in cooperative relationship with said lamp housing and lens system, a web directing means s0 arranged with respect to said receiver and lens system as to provide a vertical projection field, recording means responsive to code signals including a type carriage and a platen movable therewith to produce lines of printing on said web in said projection eld, platen shift means, means having a slotted articulation with said shift means, means for moving said web so as to direct said lines of printing upwardly across said projection eld, mirrors and an objective lens mutually co-operative so as to produce upon a screen an image moving thereacross in correspondence with the movement of the web through said projection eld, and over- 7. In combination, a printing deviceV having a carriage -movable to form character spaces, a platen movable with said carriage, platen 8. In combination, a printing device having a carriage movable to form character spaces, means for directing record material through said device guiding said material in a and adjacent to said carriage, means comprising a projection system for projecting onto a screen images of the characters produced on said record material, means for case shifting said guiding means, and overcentering means to accelerate shifting movement of said guiding means to minimize the optical effect of said shifting movement upon the image.

WALTER J. ZENNER. 

